Barry and Bonnie Hewlett had been studying the Aka and Ngandu people of central Africa for many years before they began to specifically study
the groups' sexuality. As they reported in the journal African Study Monographs, the married couple of anthropologists from Washington State
University "decided to systematically study sexual behavior after several campfire discussions with married middle-aged Aka men who mentioned
in passing that they had sex three or four times during the night. At first [they] thought it was just men telling their stories, but we talked to women and
they verified the men's assertions."